Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d512a7e2ca8141…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 11:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 506b7c0f8a92dbfe6e34d2fc52b04c42 SHA-1: 349ecceb19ce36ce97abf7c551b59c079da3aeeb SHA-256: e3d512a7e2ca81417f5f5b83e4a24e8a22f80033601c5b54d122e7281287a6f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=elevated+intracranial+pressure PDF link annotation
    • https://nestaerospace.com/uploads/file/fufefifosopa.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/bbf08fa36523d433a0bebf20add47869/72850922735.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6bbef954---nulapevagax.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b190e31ef---fusigisopafavarumoluda.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/58997259300.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/93595330383.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/72782529487.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/81893477569.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/689576ddaba8afd622edb755d6869428/kebov.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5c681e0959d3989e47594d441e8643/74891901099.pdfIn PDF document text
    • http://mintowncoffee.net/uploads/images/files/satazefuruserakiposurifo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/550cba82f964ada8fce283811210e7e0/75589997380.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4ec4c1---19588756576.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d600f70---20535568593.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a6040fea---53325657274.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/negal.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/18929773419.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/053bfadc4a287542c7492bd3f8b0b318/81228196842.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609939c93f4cf---2028856077.pdfIn PDF document text
    • http://www.celso.org/download/kebuxegowufabuxokijo.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/vekigofobuwobazavutemofu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/541959c0416ba90cd01e0542d0cac777/kawukuvagurapatireju.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8303c56a8ee90846925d34275dffeeba/kapimiwemonosipinozepub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 17160 bytes
SHA-256: f50ef11b2575fd3f4b87e9e2c5463f66c3d4397d51c5d9d1207d2322bb500cee
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10536 bytes
SHA-256: 50152dce68ccddc724d00ac57e7502b70f12bf466a8ecbf61ffaa38fc674dc9f
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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